Gower R. Roger. (2006). Grammar in practice 6. Upper-intermediate: 40 units of self-study grammar exercises. Edinburgh, Cambridge University Press, 2006.
Цитирование в стиле Чикаго (17-е изд.)Gower R. Roger. Grammar in Practice 6. Upper-intermediate: 40 Units of Self-study Grammar Exercises. Edinburgh, Cambridge University Press, 2006, 2006.
Цитирование MLA (9-е изд.)Gower R. Roger. Grammar in Practice 6. Upper-intermediate: 40 Units of Self-study Grammar Exercises. Edinburgh, Cambridge University Press, 2006, 2006.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.